Question # 1

Which force is not a conservative force:

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Frictional force

Gravitational force

Electric force

Elastic spring force

Which force is not a conservative force?

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Frictional force

Gravitational force

Electric force

Elastic spring force

The work done on the body will be zero if:

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No force is applied on the body

Force is applied but no displacement

Angle between F(force) and d(displacement) is 90°

All of these are correct

A field in which the work done is moving a body along closed path is zero is called:

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Nuclear filed

Conservative field

Gravitational field

Non-conservative field

Work done in lower and bucket into the well is:

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Zero

Positive

Negative

None of these

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

The work performed on an object does not depend on

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

Which of the following is not a unit of power:

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J-sec

Watt

N m/sec

Horsepower

The space around the earth in which its gravitational force acts on a body is called

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Electric Field

Gravitational field

Magnetic field

Conservative field

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. the angle which the force makes with the direction of motion will be:

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60°

90°

30°

0°

Escape velocity from surface of Moon as compared to that from Earth surface is:

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Greater

Smaller

Equal

None of thes

When a falling body hits ground, its KE changes to _____ energy.

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Potential

Chemical

Mechanical

sound and heat

Work done by the force of friction is always

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Positive

Zero

Negative

Maximum

1 J = ________?

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10⁷erges

10^-7erges

10⁵erges

10^-5erges

Work done on a body by gravity in lifting it up to certain height is

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Maximum

Minimum

Zero

Negative

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

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